http://onlinelibrary.wiley.com/doi/10.1002/ajhb.22604/abstract
Ancient DNA evidence reveals that the Y chromosome haplogroup Q1a1 admixed into the Han Chinese 3,000 years ago
Yong-Bin Zhao1,2, Ye Zhang1, Hong-Jie Li3, Ying-Qiu Cui1, Hong Zhu3 and Hui Zhou1,3,*